The telescope has a spherical mirror, the transverse diameter of which is D=0.5 m and the radius of curvature R=2 m. At the main focus of the mirror F, a radiation detector in the form of a round disk is placed. The disk is located perpendicular to the optical axis of the mirror (Fig. 14.19). What must be the radius r of the receiver so that it can receive the entire flux of radiation reflected by the mirror? How many times will the radiation flux received by the receiver decrease if its size is reduced by 8 times? Directions. When calculating for small values of a, where a
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